Well, the Hijri date 21 Shaban 1374 corresponds to the Gregorian date Thursday, 14 April 1955. This date lies in the eighth month of the Hijri year 1374 AH, which is Shaban of 1374 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1374/08/21 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 14 April 1955 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shaban 1374 AH to its equivalent Gregorian date.
أَمْ يَقُولُونَ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًۭا ۖ فَإِن يَشَإِ ٱللَّهُ يَخْتِمْ عَلَىٰ قَلْبِكَ ۗ وَيَمْحُ ٱللَّهُ ٱلْبَٰطِلَ وَيُحِقُّ ٱلْحَقَّ بِكَلِمَٰتِهِۦٓ ۚ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is Aware of what is hidden in the breasts (of men).
Surah Ash-Shura(42:24)
Sahih al-Bukhari
Divorce
Chapter: Ash-Shiqaq (the breach between the man and his wife).
Narrated Al-Miswar bin Makhrama Az-Zuhri:
I heard the Prophet (ﷺ) saying, "Banu Al-Mughira have asked my leave to let `Ali marry their daughter, but I give no leave to this effect."
Sahih al-Bukhari 5278